CN1203202A - Method and device for cutting breakable plane workpiece, particularly, plate glass product - Google Patents
Method and device for cutting breakable plane workpiece, particularly, plate glass product Download PDFInfo
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- CN1203202A CN1203202A CN98109406A CN98109406A CN1203202A CN 1203202 A CN1203202 A CN 1203202A CN 98109406 A CN98109406 A CN 98109406A CN 98109406 A CN98109406 A CN 98109406A CN 1203202 A CN1203202 A CN 1203202A
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- 238000005520 cutting process Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000005357 flat glass Substances 0.000 title claims description 18
- 230000005855 radiation Effects 0.000 claims abstract description 127
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- 230000007246 mechanism Effects 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 21
- 230000003287 optical effect Effects 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 17
- 230000001276 controlling effect Effects 0.000 claims description 12
- 230000008520 organization Effects 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 239000003034 coal gas Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 230000011514 reflex Effects 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 claims 1
- 239000011521 glass Substances 0.000 abstract description 55
- 238000009826 distribution Methods 0.000 abstract description 7
- 239000012634 fragment Substances 0.000 abstract description 5
- 208000013201 Stress fracture Diseases 0.000 abstract description 4
- 230000035882 stress Effects 0.000 description 8
- 238000005452 bending Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 238000007373 indentation Methods 0.000 description 6
- 230000014509 gene expression Effects 0.000 description 5
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- 230000004927 fusion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 206010020843 Hyperthermia Diseases 0.000 description 1
- 241000220317 Rosa Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
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- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000036031 hyperthermia Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000005373 pervaporation Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/073—Shaping the laser spot
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
- B23K26/0821—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head using multifaceted mirrors, e.g. polygonal mirror
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B33/00—Severing cooled glass
- C03B33/09—Severing cooled glass by thermal shock
- C03B33/091—Severing cooled glass by thermal shock using at least one focussed radiation beam, e.g. laser beam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T225/00—Severing by tearing or breaking
- Y10T225/10—Methods
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T225/00—Severing by tearing or breaking
- Y10T225/30—Breaking or tearing apparatus
- Y10T225/304—Including means to apply thermal shock to work
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Toxicology (AREA)
- Health & Medical Sciences (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Laser Beam Processing (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The method and apparatus for cutting through flat workpieces made of glass can cut through workpieces with greater thickness, e.g. glass panes with a thickness greater than 0.2 mm, than possible up to now with a comparable known method, without micro-fractures, glass fragments or splitter. In the method of the invention a heat radiation spot symmetric to the cutting line is produced on the workpiece. This heat radiation spot has edge portions with elevated radiation intensity and is moved along the cutting line and/or the workpiece and the heated section of the cutting line is subsequently cooled. A scanner motion produces the heat radiation spot so that edge portions of elevated radiation intensity coincide with a V- or U-shaped curve, which is open at the leading end of the heat radiation spot. The peak portion of the V- or U-shaped curve on the cutting line is at a temperature maximum that is under the melting point of the workpiece material. A controller of the scanning motion controls the scanner in circular cutting and freeform cutting so that a curved V- or U-shaped intensity distribution which fits the curved cutting path arises.
Description
The present invention relates to a kind of method of, the flat work pieces and the particularly plate glass product that are used for cutting breakable as described in the preamble as claim 1.The present invention relates to a kind of as claim 10 device as described in the preamble.
Traditional cutting method of flat glass is based upon on such basis, promptly at first with diamond or cutters at generation cut on glass, so that cut apart glass with other mechanical force along the weak location that so forms subsequently.Disadvantageously, particle (fragment) is because of indentation comes off from the surface in this method, and these particles may be deposited on glass and for example cause scratch on glass.May occur so-called " tomography relief " in the cut edge equally, this causes glass edge unfairness and and then the high subsequent machining cost of needs.In addition, the microfracture that comes across the place, cut edge when delineation has caused the high risk of breakage of mechanical stress intensity that reduces.
In order not only to avoid fragment, also avoid tomography relief and microfracture, beginning is cut apart glass on the basis of the living stress of heat.In this case, aim at the thermal stresses that thermal source at the uniform velocity passes through and generation is so high so that the glass cracking of glass above glass.Required thermal source performance can be partly promptly accurately and preferably millimeter level ground (this is corresponding with the standard cutting accuracy) determine the heat energy position, welding burner and the particularly laser apparatus of infrared radiator, special use just are enough to.Because of its good focusing performance, good power control performance and beam processability and its are selected laser apparatus for use in intensity distribution on glass.
DE-AS1244346 discloses a kind of glass rose method, has wherein also set a temperature that is lower than the glass melting temperature with laser beam here along the cutting track heating glass.At heating postcooling glass and by knocking or bend mode disjunction glass.Can also carry out the heating on the fusing point, thereby fusion goes out a finedraw.
GB-PS1433563 has described a kind of method of utilizing two bundle laser works.Utilize a branch of low-energy laser to carry out preheating here.
In DE4411037C2, described a kind of method, wherein in hollow glass, introduced one 250 ℃ belt stress district by laser beam.After introducing the stressed zone, with scriber and by mechanically introducing initial short crack with of short duration contact the on hollow glass surface, this crack is located substantially on the track of laser beam maximum intensity and sets top temperature simultaneously.Cool off described stressed zone by the liquid-soaked fiber, improve heat sudden change and stress subsequently, thereby make initial crack form the cutting seam.
US5237150 has described a kind of Plate Steel cutting technique.It adopts the ring mode laser beam to protect condenser lens.Laser beam circularizes when hitting lens, thus the situation during with some shape bump compare, laser beam energy distribution has been avoided the lens material local superheating thus on a bigger lens surface.But laser beam still is converged to a bit on workpiece by condensing lens.During not as ring-shaped light spot, in this hot spot point, there is not the high strength in the marginarium, this is that this " point " conduct " cut point " is along the cut-off rule cutting steel plate because annular beam becomes one " point ".
In described method, adopted TEM equally according to EP0062484
0The ring mode laser beam.This laser beam is point-like and accumulates on the workpiece.If but laser beam is when becoming point-like to focus on, then maximum of intensity is a little synthetic.Because laser beam focuses on the workpiece surface, so glass is evaporated to certain depth.All the other glass in cut section are heated to more than the melting temperature always.To blow away through the glass material of pervaporation by gas.
DE-OS4305107 relates to a kind ofly cuts apart the method and apparatus of glass with laser beam, wherein laser beam be divided into two bundle infinite rays and relatively cut-off rule two restraint laser-impact glass with this symmetrically.In such layout, can not form accurately spacing (± 0.1mm), but swing between two rays in the crack.
Adopted the oval-shaped laser bundle by the WO93/20015 disclosed method.Along the straight cuts nonmetal plate time, this method has shown good effect, but can not guarantee to produce first and the most accurate indentation along crooked outline.In addition, under the situation of high beam density and high-speed cutting, the cutting process unstable of this method.Related to this is that also utilizing cross section is that oval-shaped Gaussian laser beam heating has realized that beam density is distributed in the very narrow zone, wherein temperature increases progressively from periphery sensing middle ground.When the generation superheating phenomenon promptly surpasses the phenomenon of material softening temperature in the common central area at radiation zone along with the workpiece heating, in the stable hot tearing of acquisition at a high speed and under the very dark situation in crack and also will to obtain stable power density be very difficult, even in first cutting process, this also is unallowed.
As immediate prior art WO96/20062 the method for the symmetric thermal radiation hot spot of the relative cut-off rule of a kind of usefulness along frangible flat work pieces and particularly plate glass product of cut-off rule cutting described, described thermal radiation hot spot has high radiance in the marginarium that top temperature is positioned at its rear end, wherein the thermal radiation hot spot is along cut-off rule and/or workpiece motion s, and the line segment of cutting apart of heating is cooled off subsequently.These features have constituted the preamble of claim 1.
In known case, stipulated ellipse or egg type thermal radiation hot spot, minimum yield of radiation has wherein appearred in ellipse." cutting hot spot " cutting twice cut-off rule so promptly cuts cut-off rule on oval front-end and back-end.Produced disadvantageous temperature distribution (in Fig. 1 of WO document, having illustrated) thus defectively.Taken place in the proparea of ellipse cutting hot spot and along the unnecessary heating of cut direction (seeing the cut-off rule district) by the cut point that moves ahead.
Therefore, unnecessary a large amount of heating have appearred in central authorities on the cut-off rule at the cutting hot spot, thereby glass has perhaps melted in the focus end.Opposite yield of radiation in the cut-off rule zone locates very high in this focus end and temperature reaches maximum at this end.
In addition, can only utilize this method cutting thickness to reach the glass of 0.2mm usually, this is because otherwise, fusing can take place and interrupted score under required high radiation power situation.Under the thicker situation of glass, delineation glass only takes place.
Task of the present invention is to prepare a kind of method and apparatus is provided, and can utilize particularly thicker product of this method and device cutting planes product such as the sheet glass more than the thick 0.2mm of reaching and microfracture, tomography relief or fragment can not occur.In addition, under the situation of heavy sheet glass, obtained the darker indentation of indentation that obtains than available other method.
This task realizes by the described method of claim 1.
By the described measure of claim 1, at first when thermal treatment finishes soon, on cut-off rule, introduce energy and obtained workpiece localized hyperthermia thus.So, utilize the local top temperature on the cut-off rule to produce a high mechanical stress.In the cutting starting point when weakening strength of glass, glass ftractureed on cut-off rule along feeding direction when with the postcooling cut-off rule with when before.Because the part has strengthened top temperature on cut-off rule, so very accurately formed otch behind cut-off rule, this for example is absolutely necessary in display fabrication industry.
Another advantage of the inventive method is, need not to carry out mechanical disjunction and handle and obtained neat segmentation side after heating and cooling are handled.
Under the situation of U-shaped formed according to the present invention or V-arrangement thermal radiation hot spot, the thermal radiation facular area that yield of radiation is high is positioned on V-arrangement or the U-shaped curve, and this curve is in the cut direction upper shed.Two legs and the cut-off rule of V-arrangement or U-shaped curve separate same distance, thereby under the situation of this thermal radiation light spot shape, by two maximum intensity that separate and the heated parts surface that earlier (can reach several millimeters) in wide region, wherein between these two maximum intensity local minimum temperature has appearred.Because the leg of V-arrangement or U-shaped curve is converged to vertex in thermal radiation hot spot rear end, so local minimum temperature reduces gradually, be that temperature in the cut-off rule zone increases and particularly reach local top temperature in the end on workpiece surface in thermotropism radiation spot end gradually, but this top temperature still is lower than the workpiece melting temperature.The effect of this thermal radiation hot spot is: in the spaced regions of maximum intensity, in wide region and on the degree of depth with the workpiece even heating to the temperature that is lower than fusing point.When under the situation that is positioned at the center in maximum intensity during radiation, particularly when the thermal radiation hot spot begins, above-mentioned situation is different.Behind the hot trace that so forms, and then to cool off with liquid, gas or subcooled mechanical probes, described cooling has maximum intensity on cut-off rule.Cooling causes material contracts.Owing to the big width internal heating that is positioned in top temperature on the cut-off rule, so with the stress that has produced the local maximum that on cut-off rule, has increase equally in the cooling that demonstrates maximum intensity on the cut-off rule.Can cut thicker workpiece fully thus.Evidence, stably shearing thickness is up to the sheet glass of 1.1mm.
V-arrangement or U-shaped thermal radiation spot width are preferably 0.5mm-2mm.Thermal radiation hot spot length can be 10mm-30mm.When regulating above-mentioned width and length,, consider rate of feed, thickness of workpiece, yield of radiation, material property according to the conditions such as even heating on the workpiece degree of depth.
According to a preferred embodiment, the thermal radiation hot spot is produced by laser beam flying.
Scanning is preferably carried out in oval mode, wherein in order to form U-shaped or V-characteristic, alternately connects and close laser apparatus or enhancing and reduced radiation intensity.
Device according to frangible flat work pieces, particularly plate glass product of the predetermined cut-off rule cutting in a kind of edge, wherein this device has: optical facilities, in order to produce a symmetric thermal radiation hot spot of relative cut-off rule, these optical facilities have an infrared source particularly laser apparatus and at least one optical element, described thermal radiation hot spot in its marginarium, have high radiance and in its back-end on have top temperature; One is used to make workpiece to be split and/or thermal radiation hot spot along mechanism that cut-off rule moves; One is used to cool off and is subjected to the cooling body that radiating is cut apart line segment, above-mentioned task is to solve like this, promptly, optical facilities and/or infrared source are designed to produce the thermal radiation hot spot, the high radiance marginarium of described thermal radiation hot spot is positioned on V-arrangement or the U-shaped curve, described curve is towards thermal radiation hot spot front opening, and the top temperature that wherein is positioned at the vertex place of the V-arrangement of cut-off rule or U-shaped curve partly is lower than the melting temperature of workpiece material.
According to first embodiment, adopted scanning device mechanism.Be accordingly therewith, optical facilities have the speculum of the suitable swing of two layouts that are perpendicular to one another, and described speculum so reflexes to workpiece surface with laser beam, that is, make it mark V-arrangement or U-shaped curve on workpiece surface.
For this two speculums are coordinated, the driving mechanism of these two speculums links to each other with a public regulating and controlling mechanism.The hunting frequency of these two speculums is preferably 500Hz-2000Hz, thereby can reach the cutting speed of 50mm/s-1000mm/s, and this is relevant with used yield of radiation.
According to the embodiment of another scanning device mechanism, optical facilities have mirror wheel, and the mirror wheel surface is so crooked, and promptly the laser beam by described surface reflection once marks V-arrangement or U-shaped curve on workpiece surface to be split when mirror wheel rotates.
The mirror wheel rotational frequency is 500Hz-3000Hz, thereby can reach above-mentioned rate of feed.
Preferably adopt the laser apparatus with such wavelength, promptly described wavelength is absorbed in material in a large number.For example, for glass, adopt CO
2Laser apparatus, this laser apparatus have the wavelength of 10.6um and are beneficial to preferably and remain unchanged.The peak power output of laser apparatus is generally 150 watts.
Laser intensity changes when each scanning V-arrangement or U-shaped curve, thereby V-arrangement or U-shaped curve can change yield of radiation in the cut point district.Preferably so regulate yield of radiation, promptly be no more than the temperature of fusion of workpiece.
Can adopt such scanner movements controlling organization, promptly when carrying out circle cutting and freely cut, its gated sweep device to be producing the V-arrangement or the U-shaped intensity distribution of the bending that coincide with curved path, as after also will be according to illustrating detailed description.
What substitute scanner movements is also can obtain desirable thermal radiation light spot shape by beam moulding optical system.
Another kind of may mode be to adopt TEM01
*Laser type thermal radiation hot spot, wherein optical facilities have corresponding shading piece, and described shading piece has blocked segment beam, thus the high radiance on the workpiece surface is positioned on V-arrangement or the U-shaped curve.TEM01
*Formula is by CO
2The special resonance structure of laser apparatus produces.
As for cooling body, for example can adopt subcooled metal detection head.In addition, coal gas can also be heated radiation mechanism, hydrojet mechanism or atomizer as cooling body.
Below will further describe the embodiment that the present invention exemplifies out with reference to the accompanying drawings, wherein:
Fig. 1 is a section front view of cutting apart workpiece.
Fig. 2 is the 3-D view that the thermal radiation spot intensity distributes.
Fig. 3 is the sectional view in A-A ' along the line, B-B ', C-C ' and the intensity cross section of passing thermal radiation hot spot shown in Figure 1 or temperature cross section.
Fig. 4 is the temperature distributing curve diagram along cut-off rule.
Fig. 5 is the skeleton view of optics and cooling body.
Fig. 6 is the skeleton view of another embodiment of apparatus of the present invention.
Fig. 7 a-c is the view that has another apparatus of the present invention embodiment in intensity cross section.
Fig. 8 A-C shows V-arrangement thermal radiation hot spot and the affiliated temperature distribution that leg extends to the vertex top.
Fig. 9 is the schematic block diagram of integral layout that comprises apparatus of the present invention of described controlling organization, and described device can utilize crooked thermal radiation hot spot to carry out freely cutting.
Figure 10 show form by scanning along cut-off rule, the next-door neighbour has V-shapedly or U-shaped extends and comprise the two-dimensional view of described curvature at the thermal radiation bundle of being introduced of the thermal radiation hot spot of interior bending corresponding to cut-off rule curvature ground, described thermal radiation hot spot is produced by the scanning device circulatory motion.
Figure 11 shows the thermal radiation hot spot corresponding to Figure 10, but this hot spot is produced by the scanning device to-and-fro movement.
Figure 1 illustrates the front view of sheet glass 1, described sheet glass can divide disconnection by 2 (cut-off rules) along the line.One becomes the thermal radiation hot spot 3 of U-shaped to aim at the surface of sheet glass 1 (it moves along the direction of arrow (direction of feed)).High radiation intensity area is by 4 expressions of U-shaped curve, and described curve is in the direction of feed upper shed.The shape of thermal radiation hot spot approximates ellipse half, and the wideest zone of described ellipse has constituted the front end of thermal radiation hot spot 3.
Two legs 18,19 of U-shaped curve 4 separate each other and relative cut-off rule 2 is symmetric.In thermal radiation hot spot 3 front end regions, leg 18,19 spacings are about 1mm. Leg 18,19 spacings are dwindled towards the vertex 16 that is positioned on the cut-off rule 2.
In Fig. 2, the intensity distribution of having drawn thermal radiation hot spot 3 with 3-D view.Can see that the wave crests of maximum strength reduces to vertex, the local maximum 17 relevant with cut-off rule 2 is positioned at vertex 16 places.Yield of radiation is obviously lower in the thermal radiation hot spot.Must regulate local maximum 17 accordingly with thickness of workpiece and cutting speed.Under the situation of high-speed cutting or high speed feed, the local maximum when local maximum 17 is higher than the low speed cutting.In this case, also must determine local maximum according to the yield of radiation value in curve 4 front end regions.
The local maximum relevant with cut-off rule must not be curve minimum simultaneously.For example, when not existing power control ground to use laser apparatus, intensity can be slightly higher at vertex 16 places.
Three intensity cross-sectional view of in Fig. 3, having drawn A-A ' along the line, B-B ', C-C '.Can see that curvilinear motion (by sectional view C-C ' expression) has two vertexs that separate apparently higher than two vertexs that separate in B-B ' sectional view.At vertex 16 places by sectional view A-A ' expression, maximum of intensity is still obviously lower.Owing to carrying out preheating in the wide region of cut-off rule by these two vertexs, thus with section B-B in the cut-off rule zone ' relevant temperature profile only shows lower local minimum.By the vertex place come this minimum value of balance than small intensity, thereby the temperature variation when demonstrating maximum value at vertex 16 places and being positioned at cut-off rule 2 districts.Maximum value still is lower than glass melting temperature Tg.
Figure 4 illustrates the temperature variations that comprises cooling point 5 along cut-off rule.
Figure 5 illustrates the device that on sheet glass 1, produces thermal radiation hot spot 3.On sheet glass 1 surface, show cut-off rule 2 and high-intensity U-shaped curve 4.Laser apparatus 6, the particularly CO of emission laser beam 7 have been adopted as the thermal radiation seedbed
2Laser apparatus.Laser beam 7 has hit vertically pivoted first speculum 8, and this speculum moves around laser beam 7 in the plane that is parallel to sheet glass 1 surface.The laser beam of swing has hit second speculum 9 around the transverse axis swing, and this speculum makes reflection lasering beam move around along directions X.The layout of speculum 8,9 can also be exchanged.According to the Overlay of these two kinds of swings, laser beam depicts U-shaped curve 4 on workpiece surface.Coordinate to have drafted a kind of public regulating and controlling mechanism 11 to obtain U-shaped curve 4 for the swing that makes these two speculums 8,9, it links to each other with the unshowned driving mechanism of these two speculums 8,9 by control circuit 10a, 10b.
Can so control speculum 8,9, promptly laser beam scans a closed curve on workpiece.In order to keep U-shaped or V-characteristic shape, correspondingly connect and close laser apparatus.
Show cooling point 5 in thermal radiation hot spot 3 back, this cooling point is to produce by the cold gas by nozzle 12 ejections.This nozzle links to each other with gas organization of supply 13.
Figure 6 illustrates workpiece 1, have triangular shaped thermal radiation hot spot 3 and aim at this workpiece surface.Intensity region is by V-characteristic 4 expressions.The also relative cut-off rule symmetric arrangement of this V-characteristic, thus vertex 16 is positioned on the cut-off rule 2.In order to regulate such V-characteristic 4, drafted a kind of laser apparatus 6, it launches the laser beam 7 that hits mirror wheel 14.Mirror wheel 14 surfaces 15 are not columniform, but are designed to curve form, thereby when mirror wheel 14 rotates one time on workpiece surface, scan V-characteristic 4 at least once.
A kind of like this layout of having drawn on Fig. 7 medium-height grass meadow has wherein adopted laser apparatus 6, and it produces TEM01
*Formula laser beam 7.Between laser apparatus 6 and workpiece 1, be provided with the tinted shade 20 that blocks half laser beam 7.In Fig. 7 b, 7c, correspondingly show the intensity cross section before tinted shade and behind the tinted shade.
Owing to can obtain high mechanical stress, be applicable to the glass of the thick 1.1mm of reaching of cutting fully so proved this method, and can not prove still that so far utilization method as described in the prior art carries out such cutting.Under the rate of feed of typical 50mm/s-500mm/s, used CO
2The power of laser apparatus is 12 watts-50 watts.At width is under the situation of 1mm, and thermal radiation hot spot length is 12mm usually on direction of feed.Cutting edge does not have tiny crack, tomography relief and fragment.Reach at thickness under the situation of the glass more than the 0.7mm, approximately perpendicular deep crack shows and reaches hundreds of microns the degree of depth deeply, and this is impossible realize with above-mentioned other method equally.
Should not understand to doctrine the name of V-arrangement or U-shaped.Also can adopt close curve such as para-curve here.Under V-arrangement hot spot 3 situations shown in Figure 6, leg 4 needn't end at vertex.As shown in Figure 8, it can have the leg 4 that always extends to the vertex top.In component 8A, V-shaped rest 4 is the same with its extension 4a long and formed hot spot like X-shaped.In component 8B, the leg 4a of prolongation is shorter than original V-shaped rest.
Adopt modification A or modification B, this depends on the material characteristic parameter of glass actually.
Usually, these characteristic parameters are hot dynamic parameter (thermal conductivity), thickness of glass, optical property (absorption laser beam).Therefore in brief, quality relates to draw a conclusion:
-thermal conductivity is good: leg length is short, and heat infiltrates in the glass fast;
-thickness is big: leg length is long, and caloric requirement spills into the time in the glass.
-absorbing: leg length is long, and caloric requirement spills into the time in the glass.
In principle, the hot spot shown in Fig. 8 B also can change (short side is on a left side) in both sides interchangeably.
Under these beam geometry situations, glass is that localized temperature gradients is very high by rapid heating, and this may cause glass to damage.Because it is short that the glass of heat oozes the hot time, so surpass glass transition temperature Tg suddenly.The result is to produce the be full of cracks of uncontrolled fracture or glass surface particulate.
Hot spot shown in laser beam spot shown in Fig. 8 A and the similar Fig. 8 B preferably has temperature curve and intensity curve shown in Fig. 8 C, have top temperature at a M.
In addition, laser beam intensity has in principle at local and gaussian shape continuous in time.If move to H point in right-angled intersection point direction from the A point at this two bundles laser that makes on glass, then produce following temperature curve:
The A point: glass has envrionment temperature
M point: single full continuous radius and arrive top temperature between A and M at the M point.This top temperature is lower than transformation temperature Tg.
H point: insulation or cooling slightly between M and H.In this stage, heat spills into glass inside more or less from the surface.By on purpose on cut direction or vertical with it direction thermograde is carried out smooth, so obviously improved cutting quality.
As shown in the figure, leg 4, the 4a among Fig. 8 A and the 8B is preferably rectilinear form.But they also can be slight curving in principle.
With the laser beam glass-cutting time, the thermal radiation spot width is significantly less than its length usually.In addition, importantly, about surface on glass, the surface point in cutting area must be accepted the heating and cooling process of certain hour concerning acceptable cutting.As a result, under the situation of accelerating cutting, beamwidth remains unchanged really, must the lengthening beam.In addition, need be to the very important high-speed cutting of equipment cutting power along the long narrow shape thermal radiation hot spot of cut-off rule.The typical length of thermal radiation bundle is that 10mm-50mm, width are 0.5mm-2mm, and its trend is the narrow width under the high precision.
As long as carry out straight cuts, it is just no problem to utilize the thermal radiation hot spot that prolongs to cut.
But in predetermined application scenario, must have the cutting of any predetermined shape.People claim such being cut into " freely to cut " or " profile cutting ".
For example when vehicle glass is cut into sheet glass or speculum and when in the flat glass sheet, introducing bigger hole, adopts the cutting of such profile.
Need the special process of considering this profile cutting.
When carrying out curvilinear cut, the track of thermal radiation Shu Bixu and crimped section coupling produces a maximum machine stress simultaneously and makes the heat input width narrow in glass to be cut.In addition, under the situation of utilizing linear thermal radiation bundle, when utilizing the thermal radiation Shu Jinhang curvilinear cut that prolongs, obtain short cutting bending radius only.Therefore under the long situation of radius of curve, can only utilize short thermal radiation Shu Jinhang processing.But the latter only has low cutting speed.
A kind of thermal radiation hot spot of prolongation that is used to form has been described so that the device of glass-cutting in WO93/20015 that has mentioned or WO96/20062.In this device, the thermal radiation bundle is according to the local shape bending of cutting curve, thereby produced the minimum deviation of relative cutting curve.Because this device is still and has utilized the fixing optical element that changes the thermal radiation bundle to process only limitedly, so being doomed this device in fact can only carry out circle cutting here, this is can only cut with constant bending radius in this case because of this device.
Though can high-speed cutting PKW glass so that make speculum or glass, it need change beam shape in cutting process under high-speed cutting, this can't accomplish in known devices.
Here, technical requirements is: when use according to aforesaid method corresponding device shown in Figure 5 cutting by friable material particularly glass make flat work pieces the time, wherein cutting is to produce by the scanning of thermal radiation bundle by the optical element that moves with the thermal radiation hot spot, so control this method or so constitute this device, promptly in the curvilinear cut process, produce the thermal radiation bundle curve shape that predetermined shape a kind of and to be cut coincide.
The effect of controlling organization 11 shown in Figure 5 is exactly to make thermal radiation bundle 7 cross sections of scanning and cut-off rule 2 cross-sections match in the curvilinear cut process.Cut in order to form freely, predetermined thermal radiation beam 7 utilizes the influence of controlling organization 11 and rotates 360 degree scopes in by the swing condition that changes two speculums of swinging 8,9 with being perpendicular to one another.In addition, as shown in Figure 9, thermal radiation bundle curvature is still coincide with indentation local curvature.In addition, need not to set up assist according to partial cut position and curvature of curve in order to produce the thermal radiation bundle.
In order to produce crooked thermal radiation hot spot, so coordinate the motion of two scanning devices, promptly produce main thermal radiation beam jitter and move along cut-off rule 2.But in this case, follow cooling point 5 still to mate, a mechanical rotating mechanism suitably is set in scanning device optics mechanism for this reason with the partial cut cutpoint in the indentation back.
Fig. 9 shows the integral layout of apparatus of the present invention with schematic block diagram, comprising affiliated controlling organization.Frame 21 expression comprises the scanning device frame of controlling organization shown in Figure 5 11, and this scanning device frame is used for producing the thermal radiation hot spot 22 of bending on 1 circular cut-off rule 23 on the workpiece that has follow-up cooling point 5.Step 24 is illustrated in the known structure control to the track of cutting process.Make frame 21,24 associated with each other on control techniques by controlled step 25, thus can be when cutting freely the cutting of radius localized variation relevant land productivity with section local curvature with optics thermal radiation Shu Jinhang processing.
Figure 10 shows the preferred embodiments of the present invention.Generally speaking, crucial part is: drafted a kind of scanning device mechanism, it allows correspondingly to change the motion of thermal radiation bundle on two-dimensional direction, promptly must can change the thermal radiation bundle that is generated by the mode that jointly controls technology simultaneously with thermal radiation Shu Yinxiang workpiece on two-dimensional direction.
Substitute mode as the bidimensional scanning device mechanism of the speculum with two swings shown in Figure 68,9, can adopt another kind of bidimensional scanning device mechanism, wherein with cut apart that direction 2 (23) has irrespectively adopted scanner axis 8a, 9a so that along cutting apart direction 2 (23) swings.Coincide according to the local curvature of cutting track and V-arrangement or U-shaped or oval beam shape at this vertical speculum.In this case, total scanning device direction can freely be rotated 360 degree angles mechanically.Particularly in modification shown in Figure 11 as will be described, scanner axis has required for this reason dynamic acknowledgment copy, and this is because and in that to cut apart the scanner axis of working on the direction relevant, scanner frequency after all has only half big like that.In addition, for along cutting apart the cutting head of curve 2 pilot tape scanning devices, it is necessary being placed in scanning device on the swinging mounting.Therefore, scanning device is being with at this closely-related cooling point in this support rotates.
Cut apart by friable material particularly glass make flat work pieces the time owing to adopted the improved measure of the present invention, be free shape so can obtain very high handiness so that high-speed cutting goes out any predetermined shape.In addition, improvement project of the present invention can advantageously be utilized the characteristic of the scanning device mechanism of the optical element that has motion, this scanning device mechanism allows the very high variability that forms beam, and it can be regulated the thermal radiation bundle with the thermal radiation hot spot that prolongs neatly and and then can high-speed cutting go out arbitrary shape on cut-off rule.
Can have the thermal radiation hot spot or the cutting hot spot of different curvature by described device production, crooked U-shaped or V-arrangement thermal radiation hot spot wherein have been shown in Figure 10,11.Produce laser beam with type by different way here.
So produce thermal radiation bundle or described thermal radiation hot spot in Figure 10, the instant heating radiation beam marks the curved path 1 of a sealing on glass surface.For this reason, the thermal radiation bundle is mainly swung along cut-off rule 2 (with its next-door neighbour).Cut apart on the direction A swing with perpendicular to the stack of the yaw motion slightly of cut-off rule 2.Here, in order to produce thermal radiation hot spot 4, as shown in the figure, thermal radiation Shu Zhihang comprise the curved path B of cut-off rule 2.But in each circulation of curved path B, when having arrived the former scanner location of cutting apart on the direction A, infrared source power returns approx and sets to zero.In addition, U-shaped or v-beam shape produce by the control infrared source.Under the situation of evenly constant infrared source output rating, the radiation beam ovalization.Perhaps, owing to block oval-shaped ray shape, so also formed U-shaped or v-beam shape.Therefore, preferably analogues such as radiation absorbing curtain are positioned in the light path.
Different with Figure 10 is, resemble and produce crooked U-shaped or V-arrangement thermal radiation bundle shown in Figure 4, this is because the thermal radiation bundle is not swung in the circulation track, but alternately swings predetermined length in cut-off rule 2 both sides, wherein returns on the follow-up output point that track is positioned at geometric locus 4.Have the thermal radiation hot spot that predetermined strength distributes in order to produce, infrared source power is not arbitrarily to adjust.But in such scanning device work, be perpendicular to the twice of the scanner frequency of cut-off rule along the scanner frequency of cut-off rule, this is because the ray in emission V-arrangement or U-shaped cross section causes.
Claims (25)
1. the predetermined cut-off rule in edge cuts frangible flat work pieces, the method of plate glass product particularly, wherein utilize the symmetric thermal radiation hot spot heating of relative cut-off rule cut-off rule, described thermal radiation hot spot has high radiance in the marginarium that top temperature is positioned at its rear end, the thermal radiation hot spot moves along cut-off rule and/or workpiece, the cut-off rule part of wherein being heated is cooled off subsequently, it is characterized in that, adopt a kind of like this thermal radiation hot spot, be that the high hot spot marginarium of its yield of radiation is positioned on V-arrangement or the U-shaped curve, described curve is towards thermal radiation hot spot front opening, and the top temperature that wherein is positioned at V-arrangement on the cut-off rule or U-shaped curve vertex place partly is lower than the melting temperature of workpiece material.
2. the method for claim 1 is characterized in that, having adopted width is the thermal radiation hot spot of 0.5mm-2mm.
3. method as claimed in claim 1 or 2 is characterized in that, having adopted length is the thermal radiation hot spot of 10mm-30mm.
4. as the described method of one of claim 1-3, it is characterized in that adopted a kind of like this thermal radiation hot spot, promptly the marginarium that its yield of radiation is high is positioned on the para-curve.
5. as the described method of one of claim 1-3, it is characterized in that two legs of V-characteristic always and preferably symmetry extend to the vertex top.
6. as the described method of one of claim 1-6, it is characterized in that in curved section, the curved shape of thermal radiation harness shape and cut-off rule coincide.
7. as the described method of one of claim 1-6, it is characterized in that, is according to the cut-off rule that utilizes the predetermined profile of scan mode under the situation that produces the thermal radiation hot spot that prolongs along the cut-off rule direction and fixed in the introducing of the thermal radiation bundle on the two-dimensional direction.
8. method as claimed in claim 7 is characterized in that the thermal radiation hot spot is formed by laser beam flying.
9. method as claimed in claim 8 is characterized in that laser beam flying is carried out in oval mode, in order to produce V-arrangement or U-shaped curve, alternately connects and closes laser apparatus or reinforcement and weaken laser beam intensity.
10. the device that cut-off rule cuts frangible flat work pieces, particularly glasswork is scheduled on an edge, and this device has:
-one optical facilities, in order to produce a symmetric thermal radiation hot spot of relative cut-off rule, these optical facilities have an infrared source particularly laser apparatus and at least one optical element, and described thermal radiation hot spot has in its back-end in the marginarium of top temperature and has high radiance;
-one is used to make workpiece to be split and/or thermal radiation hot spot along mechanism that cut-off rule moves;
-one is used to cool off the cooling body that is subjected to radiating cut-off rule part;
It is characterized in that, optical facilities and/or infrared source are designed for and produce thermal radiation hot spot (3), the high radiance marginarium of described thermal radiation hot spot is positioned on V-arrangement or the U-shaped curve, described curve is towards thermal radiation hot spot front opening, and the top temperature that wherein is positioned at the vertex place of V-arrangement on the cut-off rule or U-shaped curve partly is lower than the melting temperature of workpiece material.
11. device as claimed in claim 10 is characterized in that, optical facilities have the speculum (8 of the suitable swing of two layouts that are perpendicular to one another, 9), these two speculums so reflex to laser beam (7) workpiece (1) surface, that is, make it mark V-arrangement or U-shaped curve (4) on workpiece surface.
12., it is characterized in that the driving mechanism of these two swinging mirrors (8,9) links to each other with a public regulating and controlling mechanism (11) as claim 10 or 11 described devices.
13., it is characterized in that the hunting frequency of speculum (8,9) is 500Hz-2000Hz as claim 11 or 12 described devices.
14. device as claimed in claim 10, it is characterized in that, optical facilities have a mirror wheel (14), and this mirror wheel has curved surface like this (15), and the laser beam that promptly reflects (7) marks V-arrangement or U-shaped curve (4) at least once on workpiece when rotating.
15. device as claimed in claim 14 is characterized in that, mirror wheel (14) rotational frequency is 500Hz-3000Hz.
16., it is characterized in that laser (6) intensity changes as the described device of one of claim 10-15 when each scanning V-arrangement or U-shaped curve (4), thereby can be along trajectory generation strength relationship arbitrarily.
17. device as claimed in claim 10 is characterized in that, optical facilities have the mirror group that forms beam.
18. device as claimed in claim 10 is characterized in that, infrared source is to have TEM01
*The formula laser apparatus, optical facilities have shading piece, and described shading piece has blocked segment beam, thus the high radiance on the workpiece surface marks V-arrangement or U-shaped curve.
19., it is characterized in that cooling body is subcooled metal detection head as the described device of one of claim 10-18.
20., it is characterized in that cooling body is coal gas heating radiation mechanism, hydrojet mechanism or atomizer as the described device of one of claim 10-18.
21., it is characterized in that the effect of controlling organization (21,24,25) is that the curved shape of thermal radiation harness shape in the curved section and cut-off rule (2) is coincide as the described device of one of claim 10-20.
22. device as claimed in claim 22, it has the TRAJECTORY CONTROL mechanism (12) of cutting process, it is characterized in that, is arranged at top control level (25) by one and makes speculum (8,9) controlling organization of oscillating motion (11,21) links with TRAJECTORY CONTROL mechanism (12).
23. as the described device of one of claim 10-22, it is characterized in that, be used to determine that the mechanism of cooling point (5) position after the thermal radiation swing has the mechanical rotating mechanism that links to each other with scanning device.
24. device as claimed in claim 22, it is characterized in that, so settle the controlling organization (11) of swing, promptly along cutting apart in the oscillating motion of direction (2) and cutting apart orientation independent ground and control one of them speculum (8,9), the swing of the speculum of vertical oscillation is corresponding to the shape of local curvature's ground control thermal radiation bundle (7) of profile to be split with it, and speculum (8,9) is positioned on the rotatable support.
25. device as claimed in claim 24 is characterized in that, is used to determine that the mechanism of cooling point (5) position after the thermal radiation swing is placed in described support.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19715537.5 | 1997-04-14 | ||
| DE1997115537 DE19715537C2 (en) | 1997-04-14 | 1997-04-14 | Method and device for cutting flat workpieces made of brittle material, especially glass |
| DE19734823 | 1997-08-12 | ||
| DE19734823.8 | 1997-08-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1203202A true CN1203202A (en) | 1998-12-30 |
| CN1203013C CN1203013C (en) | 2005-05-25 |
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ID=26035761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB981094066A Expired - Fee Related CN1203013C (en) | 1997-04-14 | 1998-04-14 | Method and device for cutting breakable plane workpiece, particularly, plate glass product |
Country Status (10)
| Country | Link |
|---|---|
| US (2) | US5984159A (en) |
| EP (1) | EP0872303B1 (en) |
| JP (1) | JP3484603B2 (en) |
| KR (1) | KR100375592B1 (en) |
| CN (1) | CN1203013C (en) |
| AT (1) | ATE242675T1 (en) |
| DE (1) | DE59808669D1 (en) |
| HK (1) | HK1017335A1 (en) |
| MY (1) | MY120533A (en) |
| TW (1) | TW460422B (en) |
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- 1998-04-09 DE DE59808669T patent/DE59808669D1/en not_active Expired - Lifetime
- 1998-04-09 EP EP98106567A patent/EP0872303B1/en not_active Expired - Lifetime
- 1998-04-09 AT AT98106567T patent/ATE242675T1/en active
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| CN111014961A (en) * | 2019-12-25 | 2020-04-17 | 深圳市韵腾激光科技有限公司 | Laser cutting lobe of a leaf device |
| CN111390399A (en) * | 2020-03-12 | 2020-07-10 | 上海柏楚电子科技股份有限公司 | Cutting control method and system based on cooling point, electronic device and medium |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE59808669D1 (en) | 2003-07-17 |
| US5984159A (en) | 1999-11-16 |
| ATE242675T1 (en) | 2003-06-15 |
| MY120533A (en) | 2005-11-30 |
| TW460422B (en) | 2001-10-21 |
| EP0872303A3 (en) | 1999-12-01 |
| EP0872303B1 (en) | 2003-06-11 |
| CN1203013C (en) | 2005-05-25 |
| JP3484603B2 (en) | 2004-01-06 |
| JPH1121141A (en) | 1999-01-26 |
| KR19980081136A (en) | 1998-11-25 |
| EP0872303A2 (en) | 1998-10-21 |
| KR100375592B1 (en) | 2003-05-12 |
| HK1017335A1 (en) | 1999-11-19 |
| US6112967A (en) | 2000-09-05 |
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